yosys/tests/fmt/fuzz/x_test.cc

80 lines
2.1 KiB
C++
Raw Normal View History

#include "fuzztest/fuzztest.h"
#include "gtest/gtest.h"
#include <sstream>
#include "backends/cxxrtl/cxxrtl.h"
#include "libs/bigint/BigUnsigned.hh"
#include "libs/bigint/BigInteger.hh"
using namespace cxxrtl_yosys;
void Formats128BitUnsignedIntegers(chunk_t x0, chunk_t x1, chunk_t x2, chunk_t x3)
{
// Compare output to BigUnsigned.
value<128> v;
v = v.blit<127, 64>(value<64>{x1, x0});
v = v.blit<63, 0>(value<64>{x3, x2});
std::ostringstream oss;
oss << value_formatted<128>(v, false, false, ' ', 0, 10, false, false, false);
auto actual = oss.str();
BigUnsigned u;
u.bitShiftLeft(v.slice<127, 64>().val().get<uint64_t>(), 64);
u.bitOr(u, v.slice<63, 0>().val().get<uint64_t>());
std::string expected;
if (u.isZero()) {
expected = "0";
} else {
while (!u.isZero()) {
expected += '0' + (u % 10).toInt();
u /= 10;
}
std::reverse(expected.begin(), expected.end());
}
EXPECT_EQ(actual, expected);
}
FUZZ_TEST(CxxrtlDivisionFuzz, Formats128BitUnsignedIntegers);
void Formats128BitSignedIntegers(chunk_t x0, chunk_t x1, chunk_t x2, chunk_t x3) {
// Compare output to BigInteger.
value<128> v;
v = v.blit<127, 64>(value<64>{x1, x0});
v = v.blit<63, 0>(value<64>{x3, x2});
std::ostringstream oss;
oss << value_formatted<128>(v, false, false, ' ', 0, 10, true, false, false);
auto actual = oss.str();
BigUnsigned u;
bool negative = v.is_neg();
if (negative)
v = v.neg();
u.bitShiftLeft(v.slice<127, 64>().val().get<uint64_t>(), 64);
u.bitOr(u, v.slice<63, 0>().val().get<uint64_t>());
std::string expected;
if (u.isZero()) {
expected = "0";
} else {
// Note that we never actually do division of negative numbers: our division
// routines are flooring, not truncating, so dividing by 10 repeatedly won't
// necessarily ever get to zero.
while (!u.isZero()) {
expected += '0' + (u % 10).toInt();
u /= 10;
}
if (negative) {
expected += '-';
}
std::reverse(expected.begin(), expected.end());
}
EXPECT_EQ(actual, expected);
}
FUZZ_TEST(CxxrtlDivisionFuzz, Formats128BitSignedIntegers);